Merge tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

Tanish Desai and Paolo Bonzini's tracing Rust support.

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# gpg: Signature made Wed 01 Oct 2025 08:30:42 AM PDT
# gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [unknown]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [unknown]
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# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* tag 'tracing-pull-request' of https://gitlab.com/stefanha/qemu:
  tracetool/syslog: add Rust support
  tracetool/ftrace: add Rust support
  tracetool/log: add Rust support
  log: change qemu_loglevel to unsigned
  tracetool/simple: add Rust support
  rust: pl011: add tracepoints
  rust: qdev: add minimal clock bindings
  rust: add trace crate
  tracetool: Add Rust format support
  tracetool/backend: remove redundant trace event checks
  tracetool: add CHECK_TRACE_EVENT_GET_STATE
  trace/ftrace: move snprintf+write from tracepoints to ftrace.c
  tracetool: add SPDX headers
  treewide: remove unnessary "coding" header
  tracetool: remove dead code
  tracetool: fix usage of try_import()

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 64 insertions, 0 deletions

diff --git a/scripts/tracetool/format/rs.py b/scripts/tracetool/format/rs.py
new file mode 100644
index 0000000000..32ac4e5977
--- /dev/null
+++ b/scripts/tracetool/format/rs.py
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+"""
+trace-DIR.rs
+"""
+
+__author__     = "Tanish Desai <tanishdesai37@gmail.com>"
+__copyright__  = "Copyright 2025, Tanish Desai <tanishdesai37@gmail.com>"
+__license__    = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__      = "stefanha@redhat.com"
+
+
+from tracetool import out
+
+
+def generate(events, backend, group):
+    out('// SPDX-License-Identifier: GPL-2.0-or-later',
+        '// This file is @generated by tracetool, do not edit.',
+        '',
+        '#[allow(unused_imports)]',
+        'use std::ffi::c_char;',
+        '#[allow(unused_imports)]',
+        'use util::bindings;',
+        '',
+        '#[inline(always)]',
+        'fn trace_event_state_is_enabled(dstate: u16) -> bool {',
+        '    (unsafe { trace_events_enabled_count }) != 0 && dstate != 0',
+        '}',
+        '',
+        'extern "C" {',
+        '    static mut trace_events_enabled_count: u32;',
+        '}',)
+
+    out('extern "C" {')
+
+    for e in events:
+        out('    static mut %s: u16;' % e.api(e.QEMU_DSTATE))
+    out('}')
+
+    backend.generate_begin(events, group)
+
+    for e in events:
+        out('',
+            '#[inline(always)]',
+            '#[allow(dead_code)]',
+            'pub fn %(api)s(%(args)s)',
+            '{',
+            api=e.api(e.QEMU_TRACE),
+            args=e.args.rust_decl())
+
+        if "disable" not in e.properties:
+            backend.generate(e, group, check_trace_event_get_state=False)
+            if backend.check_trace_event_get_state:
+                event_id = 'TRACE_' + e.name.upper()
+                out('    if trace_event_state_is_enabled(unsafe { _%(event_id)s_DSTATE}) {',
+                    event_id = event_id,
+                    api=e.api())
+                backend.generate(e, group, check_trace_event_get_state=True)
+                out('    }')
+        out('}')
+
+    backend.generate_end(events, group)